A little late to the game, but I've had very good Pho at Cilantro, near UC (Clifton Ave). Reasonably priced, fresh, good options in a simple but (seems to me to be) diverse menu. Full disclosure, I've never had pho elsewhere, but this makes me want to have it everywhere, which seems to be a pretty good indication!

Had a bowl of Pho last night at Linh's in Dayton, address is 4770 Airway Rd. near Wright Patterson Airforce Base. I enjoy eating there, but it is about the only place I've had pho at. Bowl of Pho and 2 soft shrimp rolls for about $10.